Twitter HQ Neighbor: ‘Dennis the Menace Moved into the Neighborhood’

It isn't. There is UK comic[1] and an unrelated US comic[2] that bizarrely began publication on the same day in 1951. Both have been made into TV and movies.

The person writing this was likely referring to the US character.

1. https://en.wikipedia.org/wiki/Dennis_the_Menace_and_Gnasher

2. https://en.wikipedia.org/wiki/Dennis_the_Menace_(U.S._comics...